- Podrobnosti
- Kategorie: Elektronika
I got an old APC Smart UPS 1500VA. UPS could perform only cold start (when I pushed power button over 5 seconds, UPS starts, but running only on battery) .
When i pressed power button, the UPS only beeped shortly and nothing happend. When i connect UPS to the computer and use APC software, I can see that the UPS has detected 230VAC on the power plug. After one hour exploration i was found problem. I don't know why, but it was destroyed transistor Q10.
It was MMBT2222A. After replacing for a new one, everything works. Maybe it helps someone.
- Podrobnosti
- Kategorie: Elektronika
I had one UAP Pro in strange state. UAP shines after powering up only white, can do firmware recovery via TFTP, but after update light goes off. It does not automatically reboot after update and it still has a problem when it is turned on. I used PL2303 USB to TTL RS232 converter connected to 4 pin header inside Unifi unit and terminal program Tera Term to see what is wrong. This is what i seen:
U-Boot unifi-v1.6.15.278-g4ebbbcff (Mar 5 2018 - 23:40:54)
DRAM: 128 MB
Base:0x80000000, Top:0x88000000, Res logbuf:0xa7ffb000, log_magic:0xedddf96a kseg: 0xa0000000
Flash: 16 MB
PCIe WLAN Module found (tries: 1).
Net: eth0: dc:9f:db:1a:89:5a
eth0
Setting 0xb8116290 to 0x20402d0f
Board: Copyright Ubiquiti Networks Inc. 2014
Hit any key to stop autoboot: 0
Board: Ubiquiti Networks AR9344 board (e507-21.2122.0030.0030)
0. Name = u-boot, offset = 0, start_addr=9f000000, size=262144,start_sector=0, end_sector=3
1. Name = u-boot-env, offset = 40000, start_addr=9f040000, size=65536,start_sector=4, end_sector=4
2. Name = jffs2, offset = 50000, start_addr=9f050000, size=16121856,start_sector=5, end_sector=250
3. Name = cfg, offset = fb0000, start_addr=9ffb0000, size=262144,start_sector=251, end_sector=254
4. Name = EEPROM, offset = ff0000, start_addr=9fff0000, size=65536,start_sector=255, end_sector=255
UBNT application initialized
Scanning JFFS2 FS: .| Unknown node type: e002 len 4164 offset 0xf530d8
Unknown node type: e002 len 2736 offset 0xf5f408
done.
Error: none of the image file is good!
ar7240><INTERRUPT>
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